Thor Kitchen Dishwasher Error Code E4

E4 on a Thor Kitchen dishwasher signals an overflow condition, meaning water has been detected in the base pan beneath the dishwasher tub. The dishwasher stops operation automatically to prevent further water damage. The leak can come from the door gasket, hose connections, inlet valve, or internal pump components. The water supply should be shut off immediately before any inspection or service is performed.

Simply resetting the dishwasher is unlikely to permanently clear E4 if the underlying leak has not been fixed. The base pan may also need to be fully dried before the overflow sensor resets, as a wet sensor will continue triggering the code. Even if the error temporarily clears after drying, it will return if the leak source is not repaired.

Repair costs vary depending on the source of the leak. A door gasket replacement is typically the least expensive fix, with parts and labor generally ranging from around $75 to $175. Inlet valve or hose repairs may fall in the $100 to $250 range, while pump or sump seal repairs can cost more, potentially $200 to $400 or higher depending on the extent of the damage and local labor rates.

No, you should not continue running the dishwasher while E4 is active. The code indicates water is leaking into an area it should not reach, which poses a risk of water damage to your cabinetry, flooring, and nearby electrical components. Turn off the water supply to the appliance and leave it off until the source of the leak has been identified and repaired.

Start by shutting off the water supply and identifying the source of the leak. Check the door gasket for damage, inspect hose connections for looseness or cracks, and confirm you are using the correct dishwasher detergent. If no obvious external cause is found, a technician will need to access the base pan and internal components to locate the leak and replace the faulty part before returning the unit to service.